Solve the Problem $3 \mathrm{hr}$ If Her Rate Rowing Back Was

Multiple Choice

Solve the problem. Round your answer to the nearest tenth, if necessary.
-Sue rowed her boat across and back Lake Bend in $3 \mathrm{hr}$ . If her rate rowing back was $2 \mathrm{mph}$ less than the rate rowing across, and if the distance each way was $7 \mathrm{mi}$ , find her rate rowing across.

A) $5.5 \mathrm{mph}$
B) $1.5 \mathrm{mph}$
C) $5.9 \mathrm{mph}$
D) $3.7 \mathrm{mph}$